Patch "security: keys: perform capable check only on privileged operations" has been added to the 4.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    security: keys: perform capable check only on privileged operations

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     security-keys-perform-capable-check-only-on-privileg.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 962efaed1a4c7fe6e40c93b4ac5e239ee72745b4
Author: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
Date:   Thu May 11 14:32:52 2023 +0200

    security: keys: perform capable check only on privileged operations
    
    [ Upstream commit 2d7f105edbb3b2be5ffa4d833abbf9b6965e9ce7 ]
    
    If the current task fails the check for the queried capability via
    `capable(CAP_SYS_ADMIN)` LSMs like SELinux generate a denial message.
    Issuing such denial messages unnecessarily can lead to a policy author
    granting more privileges to a subject than needed to silence them.
    
    Reorder CAP_SYS_ADMIN checks after the check whether the operation is
    actually privileged.
    
    Signed-off-by: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
    Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
    Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 9394d72a77e80..9e52a3e0fc672 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -922,14 +922,19 @@ long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group)
 	ret = -EACCES;
 	down_write(&key->sem);
 
-	if (!capable(CAP_SYS_ADMIN)) {
+	{
+		bool is_privileged_op = false;
+
 		/* only the sysadmin can chown a key to some other UID */
 		if (user != (uid_t) -1 && !uid_eq(key->uid, uid))
-			goto error_put;
+			is_privileged_op = true;
 
 		/* only the sysadmin can set the key's GID to a group other
 		 * than one of those that the current process subscribes to */
 		if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid))
+			is_privileged_op = true;
+
+		if (is_privileged_op && !capable(CAP_SYS_ADMIN))
 			goto error_put;
 	}
 
@@ -1029,7 +1034,7 @@ long keyctl_setperm_key(key_serial_t id, key_perm_t perm)
 	down_write(&key->sem);
 
 	/* if we're not the sysadmin, we can only change a key that we own */
-	if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) {
+	if (uid_eq(key->uid, current_fsuid()) || capable(CAP_SYS_ADMIN)) {
 		key->perm = perm;
 		ret = 0;
 	}